Incentive Tax Grant (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Income Taxes [Line Items]
Tax benefit	$ 53.3	$ 3.7	[1]	$ 44.6
Per share benefit	$ 0.62	$ 0.04	[1]	$ 0.47

[1] No tax benefit was recognized from the incentive tax grant in Puerto Rico due to the charge for Hernia Product Claims.